LIB add dynatree
dynatree: send with ajax
cosmetic
dynatree: display columns
dynatree: load from server (not yet working)
code cleanup
dynatree: load from server (not yet working)
WBS : lecture et affichage de l'arbre de la BDD
WBS Save and Load from DB
WBS WBSElement2
WBS WBSElement2 createTreeFromDynatreeData()

not finished
WBS WBSElement2 createTreeFromDynatreeData()

not finished
WBS WBSElement2 : load from DB

(not finished)
WBS wbs_reader : load via Ajax
WBS wbs_reader : load & save via Ajax (TODO: nodesToDelete)

creation & save is ok, but folders are not yet deleted, so move won't work fine
WBS wbs_editor : nodesToDelete
WBS: add root element at Command creation